Joined some entrepreneurship seminar. It was useful. Just overpriced. There was a Facebook group for participants.

My cofounder was selling ebooks on business advice in that group. He wasn't particularly famous but offered a 100% money back guarantee and the books were like $5 anyway. They were good advice, some of which I still quote today and get a bunch of upvotes for on HN lol. He had some Facebook groups of his own. We'd post about these kinds of things, as you do in HN today.

One day, after struggling with trying to find employment and freelance clients I decided to just make an app company. I wanted to do e-commerce, figured I needed a partner who had experience with the offline part. Since I was buying books on logistics and stuff from this guy, I offered to meet him and pay for his latest book, but instead of paying cash price, I'd pay for a meal that cost more than the book. He was happy to meet. We clicked. Built a startup and sold it for decent profit after a year... we did run out of money and it was easier to get acquired than funding.

I know YC says don't do businesses with strangers off the internet but it works for me. Dude was really ride or die, and stuck through the lowest lows. Heck I met my wife by sending SMSes to strangers, but that's a story for another day.

Old-fashioned I guess: LinkedIn

I applied for a CTO position out of curiosity, had a conversation with the CEO (now my cofounder) and hit it off. I was "lucky" to have worked with a so-so CEO previously so I knew exactly what soft skills and personality I wanted in a co-founder.

Check out YC's https://www.startupschool.org

IMHO if you can’t get a good co founder, don’t bother.

If you’re driven you can figure it out and fill in the blanks.

If you’re successful just hire the roles you want to fill.

I used to run web-studio and had a talented full-stack developer on one of the projects.

He showed himself as a very hardworking, dedicated, loyal & honest person.

When I've decided that I need a co-founder a few months later, I just called him and offered it straightforwardly.

4 years together building products since then.

I evaluated personality only, and that worked for me.

Claude and I have discovered many synergies.

We met on a project in a bank. Worked together for a number of years. Became friends.

We trust, respect and understand each other. I think that's really important. You'll be going through think and think together.

My former manager. We worked together 6 years before our two ventures together. Neither was successful in the end, but we remain friends.

Ex colleague (reportee) from one of jobs I had

in google ai studio

my other cofounder is my cousin